"Here's what the researchers think is occurring: Water that comes from melting at the bottom of the ice sheet, or water that streams down from the surface along crevasses and tubular shafts called moulins, refreezes at the bottom of the ice sheet. Over hundreds to thousands of years, the refreezing process warms, softens and warps the ice above the base of the ice sheet, creating the giant jellyroll-like structures discovered using radar. These structures could be up to 3,280 feet (1,000 m) in height, Bell said. They get bigger and are more common as the ice sheet narrows into the ice streams headed out to sea."
More: http://www.huffingtonpost.com/2014/06/17/greenland-ice-sculptures_n_5503710.html
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